P0305 on a Volvo: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

If the check engine light is flashing, stop driving — a severe misfire can damage the catalytic converter. A steady light is usually safe for a short drive to a shop.

What P0305 means on a Volvo

On a Volvo, P0305 means the engine computer detected a misfire on cylinder 5. Volvo's five-cylinder engines have a cylinder 5 at the end of the line, and the six-cylinder models also have one on the bank opposite cylinder 1. Because the code names one cylinder, the cause is usually its ignition coil, spark plug, or injector.

Is P0305 common on Volvos?

P0305 is common on Volvo five-cylinder models like the S60 and V70, and on six-cylinder models like the S80 and XC90. Worn spark plugs and failing ignition coils are the most common causes at higher mileage. Clogged or leaking injectors are less common but can misfire one cylinder.

Commonly reported on: S60, V70, S80, XC90.

Symptoms

Check engine light on (flashing if severe)
Rough idle or shaking
Loss of power or hesitation
Poor fuel economy

Common causes

most common: Worn or fouled spark plug on cylinder 5
common: Failing ignition coil on cylinder 5
less common: Clogged or leaking fuel injector
less common: Wiring or connector issue at the coil
less common: Low compression from engine wear

How to fix it

Fix	DIY?	Typical cost
Replace the spark plug on cylinder 5 (or all plugs)	Yes	$40–150
Replace the ignition coil on cylinder 5	Yes	$80–250
Replace or clean the cylinder 5 injector	Mechanic	$200–500
Run a compression test if the misfire returns	Mechanic	$100–200

Frequently asked questions

Which Volvos have a cylinder 5?

Five-cylinder models like the S60 and V70, plus six-cylinder models like the S80 and XC90. Four-cylinder Volvos set P0301–P0304 instead.

What usually causes P0305 on a Volvo?

A worn spark plug or failing ignition coil are the most common causes. On 5-cylinder Volvos, cylinder 5 is at the end of the engine, so it's easy to reach.

Is it safe to drive my Volvo with P0305?

A steady light is usually okay for short trips. A flashing light means a severe misfire, so stop and have it towed.